A 1 oz tank is a heck of a lot of fuel for a Cox Surestart. I fuel mine up with about 1/4 oz and get about 4 minutes. I would think 1/2 oz is more than enough. Brodak has a good selection of small tanks. A 3/8 ounce wedge tank would be great. I have made tanks with a finger cut from a vinyl glove with great success. Works upside down too. if you want to use the pill bottle idea, which I have given thought to myself, I think a small shampoo bottle from a hotel would work nicely. Although I think I would install my vinyl glove bladder tank inside the bottle instead of using the bottle itself as the tank. The bladder is better for stunting.